
//OddEven.java
import javax.swing.JOptionPane;
 
public class OddEven {
    // "input" is the number that the user gives to the computer
    private int input; // a whole number("int" means integer)
 
    /*
     * This is the constructor method. It gets called when an object of the OddEven type
     * is being created.
     */
    public OddEven() {}
 
    // This is the main method. It gets called when this class is run through a Java interpreter.
    public static void main(String[] args) {
        /*
         * This line of code creates a new instance of this class called "number" and 
         * initializes it, and the next line of code calls the "showDialog()" method, 
         * which brings up a prompt to ask you for a number
         */
        OddEven number = new OddEven();
        number.showDialog();
    }
 
    public void showDialog() {
        /*
         * "try" makes sure nothing goes wrong. If something does, 
         * the interpreter skips to "catch" to see what it should do.
         */
        try {
            /*
             * The code below brings up a JOptionPane, which is a dialog box
             * The String returned by the "showInputDialog()" method is converted into
             * an integer, making the program treat it as a number instead of a word.
             * After that, this method calls a second method, calculate() that will
             * display either "Even" or "Odd."
             */
            input = Integer.parseInt(JOptionPane.showInputDialog("Please Enter A Number"));
            calculate();
        } catch (NumberFormatException e) {
            /*
             * Getting in the catch block means that there was a problem with the format of
             * the number. Probably some letters were typed in instead of a number.
             */
            System.err.println("ERROR: Invalid input. Please type in a numerical value.");
        }
    }
 
    /*
     * When this gets called, it sends a message to the interpreter. 
     * The interpreter usually shows it on the command prompt (For Windows users) 
     * or the terminal (For Linux users).(Assuming it's open)
     */
    private void calculate() {
        if (input % 2 == 0) {
            System.out.println("Even");
        } else {
            System.out.println("Odd");
        }
    }
}
